Brake-shoe



w, GIBSON. BRAKE SHOE. APPLICATION FILED AUG-i6. 1919.

1,349,128. t nt ik g- 10,1920.

Wines-.9 8:

flan M UNITED STATES,

PATENT OFFICE.

WILLIAM GIBSON, OF P IT'ISBIIRGI-I, PENNSYLVANIA.

BRAKE-SHOE.

Specification of Letters Patent.

Patented Aug. 10, 1920.

Application filed August 16, 1919. Serial No. 317,896.

To all whom it may concern:

Be it known that I VVILLIAM GIBsoN, a citizen of the United tates, and a resldent of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Brake- Shoes; and I do hereby declare the following to be a full, clear, and exact description thereof. A

My invention relates to brake-shoes, and has special reference to the class of brakeshoes which are provided with an inclosedmetallic casing around a filling or body of frictional material for engagement with a wheel in braking.

The object of my invention is to provide a cheap, simple and efficient form of a brake-shoe, wherein the ends or sides of such shoe will notcut into or wear down the tread or throat of the wheel on which it is used, and one in which such ends or sides will wear down evenly and uniformly with the filling of frictional material.

A still further object of the invention'is to keep the metal of the casing or cap of the shoe from engaging the wheel when in use,

so that when the shoe is worn down to such brake-shoe embodying my invention;

Fig. 2 is a side elevation, partly in section, of the same;

Fig.3 is a bottom plan view of the shoe;

' Fig. 4 is a cross-section of the shoe on the 7 line 3-8, Fig. 2;

Fig. 5 is an end view of theshoe;

Fig. 6 is a sectional view showing one end of the shoe; taken on the line VIVI Fig. 1; and i Fig. 7 is a perspective view of one of the end plates.

Like symbols of reference herein indicate like parts in each of the figures of the sheet of drawings.

As illustrated in the figures of the drawings, my improved brake-shoe is shown at a and has the usual shape or curvature, such shoe being provided with an inclosing casing or cap or supporting member 1 and a frictional filling or body member 2 of frictional material inserted in said casing or cap in any suitable manner. This filling member 2 is adapted to engage with the wheel and the rubbing or frictional action of the brake-shoe upon the wheel is exerted by such frictional member, which consists of any suitable material, such as cast iron or composition of matter or other material secured within the casing or cap 1 to exert proper and sufficient friction upon the periphery of the wheel without the imposition of undue or excessive wear thereon and the loss of wheel metal consequent thereto, and such compositions are of a character familiar to those skilled in the art.

The casing or cap 1 is formed from any suitable material, preferably from band, sheet, plate or other metal having a substantial degree of strength and durability, such as malleable, wrought or other steel or iron,

and when formed from sheet or plate metal it is pressed or bent by suitable dies into a structure having an integral back wall 3, side lips a and end lips 5, as well as being open at the front for the insertion of the filling member 2 and curved substantially in accordance with the periphery of the car wheel on which the brake-shoe is to be used. The end lips 5 are cut away at their inner ends, as at 5, and this with the short side lips 4: allows for providing the deep corners at on the casing 1 between such lips 4: and 5 to support the filling member 2 and plates 9.

The usual supporting lug 6 is connected or fixed to the back 3 of the casing or cap 1 in any suitable manner for connecting the shoe (4 to the ordinary approved brake-head or hanger (not shown) and is preferably separate therefrom, as shown, by having the inner ends 7 passed through slots 8 in said back and turned against the inner face of the same to connect said lug to said casing or cap. Short bearing surfaces 7 are formed adjoining the ends on the back 3 of the casing 1 which are adapted to bear against bearings on the ends of the brakehead or hanger, and such bearings are preferably recessed, as at 7'. Central or intermediate bearings on the head or hanger are adapted Y to abut against said back wall 3 of the I casing or cap. These end and side pie'ces or plates 9 when so placed within the casing or" cap 1' and against the filling member 2 will form the end and side walls of the finished shoe a and assist with such casing in holding the material comprising such member in place, and such pieces or plates are made of any convenient relatively softer material, what is commonly known as vulcanized fiber having been found satisfactory in prac- I tical use. The side pieces or plates 9 can be formed of different thicknesses, and if desired, of the same thickness as the side lips 4 'on the casing or cap so that their exterior surfaces are flush with the exterior surfaces of saidlips and thus strictly conform in shape and size to the Master Car Bullders istandards; and in order to hold such plates against said lips and allow such flush sur faces to be obtalned, the plates are provided with a turned or bent portlon 10 at their 1nner or upper edges whlch forms seats 11 for the reception of the lower or outer end edge of said lips. The side pieces or plates 9 are also provided with a recessed or cut-away portion, 12' at their "ends, which form a shoulder 13 for the purpose hereinafter de scribed. j 7 c The end pieces or plates 9 fitavithin the casing'or capl and against the end lips 5 andthey are provided with a recessed or i cut-away portion 12 in the sides of the same,- which form a lug 13, so that said lug will rest against the shoulders 13 on the side plates 9, and the ends of said plates will fit within-the recesses 12 in the end plates. Theinner edge 9 of the end plates 9 fit 1 within recesses 7 of bearings 7, and such plates can also be provided with the shoulder 11 on the same for fitting against the ends of the lips 5 th'erebyallowing the, er-

terior surfaces of-thesaid plates and lips to I become flush withveach other and thus con- I form to the MasterCar Builders standard;

V arious other modifications and changes in the design and construction of my improved brake-shoe may be resorted to, without departing from the spirit of the inventlon QIj SZtCIlfiClllg any of its advantages.

In the use of the ternasoft 1n the above specification and in the claims it will be understood that the material used for the end and side plates or pieces of the brake-shoe 'willbe' flexible and resilientand is of such a nature as to be Worn away itself by friction rather than cause the wearing away of theiwheel to which the brake-shoe is applied, while such term also includes such material which will not melt from the heat of such wheel on high-speed passenger trains, and thereby form a tempered or hard material as Wlll tend to cut 1nto and 1n ure such -wheel. It has been found that the same raw material as the regular vulcanized fiber when properly treated and pressed oring, endsand sides of the shoe to wear down evenly,-uniformly and together, while'such form ofshoe will also avoid any excessive wear'on-the wheel bythe ends and sides of. the-shoe and enable a strong and durable inclosure to be formed for the fillingmaterial,

while the casing or capwhen so formed will eliminate waste and scrap in its manufacture. I It, will also be seen that in the use of my improved brake-shoe, theimetal'of the casing or cap'will beflkept from engaging with the wheel, so that the shoe can be used until it is worn down tosuch metal, thereby.

enabling only'a small portion-ofsuch shoe to remain after being used to the l1m1t, so

that it can be-scrappedxwithout great loss.

in the material composing the shoe, while the ends'and sides of the-filling member will also be protected by the side and end plates and such plates will assistthe caps in holding the filling member in place.

. V] hat. I claim as my invention and desire to secure by Letters Patent is'z' 1. A brake shoe having a supporting member and afillingmember, and separate end supporting plates formedof soft material and heldjby the co-actionvof the filling member and the supporting member, with the exterior surfaces of the end plates flush with the'outside' surface of the supporting e ber! I 2. A brake-shoe having supporting member and a fillingvmember, and separate end supporting plates formed of soft ma terial and supported in said members, the back portion of the endplates-being oifset inwardly to form a seat therein for the reception of the end of the back plate.

3. Atbrake shoe having a supporting member and a filling member, and separate end supporting plates formed of vulcanized fiber and supported in said members, the back portion of the end plates being offset inwardly to form a seat therein for there:- ception of theend'of the back plate.

4. A brake-shoe having a supporting mem ber and a filling member, and'separate end supporting plates formed .of a fibrous ma terial and supported in said supporting member and by said filling member, the back portion of the end plates being ofiset inwardly 'to form a seat therein for the reception of the end of the back plate.

5. A brake-shoe having a supporting member and a filling member, and separate end supporting plates formed of vulcanized fiber and supported in said supporting member by the same and by said filling member, the back portion of the end plates being ofiset inwardly to form a seat therein for the reception of the end of the back plate.

6. A brake-shoe having a supporting member and a filling member, said supporting member having end lips, and separate end supporting plates formed of a soft mate rial supported between said lips and said filling member, the back portion of the end plates being ofiset inwardly to form a seat therein for the reception of the end of the back plate.

7. A brake-shoe having a supporting member and a filling member, said supporting member having end lips, and separate end supporting plates formed of vulcanized fiber supported between said lips and said filling material, the back portion of the end plates being ofiset inwardly to form a seat therein for the reception of the back plate.

8. A brake-shoe having a supporting member and a filling member, said supporting member comprising a cap having an integral back and end lips, and separate end supporting plates formed of a soft mateand supported in said end lips by the same and by said filling member, the back portion of the end plates being offset inwardly. to form a seat therein for the reception of the back plate.

9. A brake-shoe having a supporting member and a filling member, said supporting member comprising a cap having an integral back and end lips, and separate end supporting plates formed of vulcanized fiber and supported in said end lips by the same and by said filling member, the back portion of the end plates being ofi'set inwardly form a seat therein for the reception of the back plate.

10. A brake-shoe having a supporting member and a filling member, separate side plates, and separate end plates formed of a soft material supported between said members by said side plates.

11. A brake-shoe having a supporting member and a filling member, separate side plates, and separate end plates formed of a fibrous material supported between said members and by said side plates.

12. A brake-shoe having a supporting member and a filling member, separate side plates, and separate end plates formed of a soft material supported between said members by connections between said side and end plates.

13. A brake-shoe having a supporting member and a filling member, separate side plates, and separate end plates formed of a fibrous material supported between said members by connection between said side and end plates.

let. A brake-shoe having a supporting member and a filling member, separate side plates, and separate end plates formed of a soft material supported between said members by a lug on said end plates engaging with a shoulder on said side plates.

15. A brake-shoe having a supporting member and a filling member, separate side plates, and separate end plates formed of a fibrous material supported between said members by a lug on said end plates engaging with a shoulder on said side plates.

16. A brake-shoe having a supporting member and a filling member, said supporting member having an integral back, end and side lips, separate side plates and separate end plates formed of a soft material and supported between said filling member and said end lips by connections on said end plates and by said filling member.

17. A brake-shoe having a supporting member and a filling member, said supporting member having an integral back, end and side lips, separate side plates and separate end plates formed of a fibrous material and supported between said filling member and said end lips by connections on said side and end plates and by said filling member.

18. A brake-shoe having a supporting member and a filling member, said supporting member having an integral back and side lips, separate side plates and separate end plates formed of a soft material and supported between said filling member and said end lips by a lug on said end plates engaging with a shoulder on said side plates and by said filling material and said end lips.

19. A brake-shoe having a supporting member and a filling member,said supporting member having an integral back and side lips, separate side plates and separate end plates formed of a fibrous material and supported between said filling member and said end lips by a lug on said end plates engaging with a shoulder on said side plates itnd by said filling material and said end In testimony whereof I, the said WILLIAM GIBSON, have hereunto set my hand.

WILLIAM GIBSON. Witness:

J. M. GEOGHEGAN. 

